You dont have to feed them as lo m g as you feed your fish it will grab whatbif floating around. If you do feed it then it will grow much faster and they tend to just look and do better overall. Target feeding once a week to a couple times a month is a good goal. Mysis, brine, well soaked pellet foods, plankton krill, Reef Roids, Reef Chilli, Coral Frenzy, Coral Delite, rotifers, cyclopeez, baby brine, fish eggs are all eaten buy acans and most other lps corals. I was never a big fan of phytoplankton, imo its good for filter feeders the do need to ne fed but not consumed much by lps. My other issues with phyto is every time I used it I would have green film algae on the glass for a few days that needed daily cleaning and imo 90% of what is fed ends up in the skimmer cup.